Shifting and locking mechanism for friction-band clutches.



No. 866,282. I PATENTEDI'SEPT. 17, 1907.

V J. 11.1mm & J. n. 'RAUGHP SHII'TING AND LOOKING MECHANISM F03 FRICTIONBAND OLUTGHES.

APPLIUATIOH FILED FEB. 12, 1907.

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Fig-Z INV NTOHS JAMES P. ARR

JljfiN DBAUCH a 7 ATTORNEYS No. 866,282. PATENTED SEPT. 17, 1907.

J. P. .KARR & J. n. RAUOH.

SHIPTING AND LOOKING MECHANISM FOR FRICTION BAND GLUTGHBS.

' APPLIGATION nun rm. 12, 1907.

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mnmmmmlmlmmg INVENTOHS P-KAR'R I JDHN DRAUEH ATTORNEYS II VI UNITEDSTATES PATENT OFFICE.

JAMES P. KARE AND JOHN D. RAUOI-I, OF LOGANSPORT, INDIANA.

l SHIFTING AND LOOKING MECHANISM FOR FRICTION-BAND CLU'IOHES.

Specification of Letters Patent.

Patented Sept. 17, 1907.

Application filed b y 12,1907. Serial No. 357,014.

To all whom it may concern:

Be it known that we, JAMES P. I ARR and JOHN D. RAUCH, citizens of theUnited States, and residents of Logansport, in the county of Cass andState of Indiana, have invented a new and Improved Shifting and LockingMechanism for Friction-Band Clutches, of which the following is aspecification.

Our invention is applicable to drums of hoisting engines for lockingthem to a countershaft which is driven from an engine or other motor.

Our improved mechanism is adapted to lock the drum automatically whenthe former is adjusted in a certain position, but both locking andreleasing of the friction band applied to the drum may be easily andquickly effected.

The details of the construction, arrangement, and combination of partsare as hereinafter described, and illustrated in the accompanyingdrawings, in which Figure 1 is mainly a central vertical section of ahoisting drum and driving gear with our improved mechanism appliedthereto. Fig. 2 is a side view of the friction band. Fig. 3 is mainly aface view of the driving gear with our improved mechanism appliedthereto, some portions being shown in section. Fig. 4 is a plan view ofthe hoisting drum, the driving gear and our improved mechanism appliedthereto, portions being broken away and shown in section for betterillustration.

In Fig. 1 a hoisting drum 1, of which a portion only is shown, ismounted loose on a shaft 2, which, in practice, is parallel to a drivingshaft operated directly from a motor. A large spur gear 3 is fast on theshaft 2, the same being driven in practice directly from the engineshaft. On the outer side the gear 3 is provided with an extended hub 3upon which is mounted a yoke 4 whose diagonally opposite arms 4 areconnected, see Fig. 3, by toggles 5 with knuckles 6 that are pivoted tocrank arms 7 and 8. These crank arms are mounted upon pins 9 and 10,respectively, which are located diametrically opposite and close to therim of the wheel through which they pass, and project from the oppositeor inner side of the same. The pin 10, see Fig. 2, passes between theband 19 and a bowed plate spring 19 whose ends are connected with theband. The function of the spring 19 is to draw the band away from theperiphery of the drum when the band is released by the toggle mechanism.The crank 8 is single, but the crank 7 is double, the arm 7 thereofprojecting on the opposite side of the pivot 9 and being connected by abar 11 with the opposite crank 8. The arm 7 and the crank 8 pro ject onthe same side of their respective pivots 9 and 10 while the crank 7projects on the side opposite or the reverse of the crank 8. The yoke 4connected with the toggle links, as before stated, is shifted on the hub3 of the drive wheel by means of a lever 12,

see Fig. 4, the inner end of the same being bifurcated and attached topins 13 on a band 14 arranged in a groove on the hub of the yoke 4, sothat the yoke may revolve freely independently of said band.

The outer end of the shifter lever 12 is pivoted loosely at 15 and it isoperated for shifting the yoke 4 by means of toggle mechanism comprisinglinks 16 and a rod 17 which is in practice connected with a hand lever(not shown). The said rod is attached to the pivot which connects thetwo links 16. The outer pivot 18 of the outer link is fixed in positionand hence by traction on the rod 17 the link 16 may be brought intoalinement, and the shifter lever 12 forced inward and the yoke 4 alsoforced inward on the hub 3 of the drive wheel, in which case it isapparent the links 5 that connect the yoke with the levers 7, 8, will bebrought into alinement with those parts. Since the cranks 7, 8, arekeyed to their respective pins 9 and 10 it is further apparent that thismovement of the toggle mechanism will cause rotation of the said pins,although it is not absolutely essential that the pin 10 should berotated. The crank pin 9 passes through a loop on one end of thefriction band 19, see Fig. 2, and its inner end through a short crank 9which is connected with the opposite end of the band 19 by a rod 20 thatpasses through a lug on the band and is provided with a spiral spring 21which normally separates the band ends when released.

It will now be understood that when the toggle mechanism 16, 17 isoperated and the shifter 12 is caused to move the yoke 4 inward on thehub of the driving wheel 3, the cranks 7 and 8 are forced apart, asindicated by dotted lines Fig. 3, whereby the pin 9 is rotated thuscarrying its crank 9, see Fig. 2, to the left and drawing the ends ofthe band nearer each other so that it is clamped on the friction surface22 of the hoisting drum 1, with the result that the drum is locked tothe gear 3 and rotates therewith until the band 19 shall be released,Nuts 23 are applied to the rod 20, see Fig. 2, and serve as means foradjusting the normal distance between the ends of the band and therebyregulating the friction with which the band may be applied to the drum.In other words this arrangement enables a primary adjustment to be madeand provides for taking up wear. When the parts are thus operated andthe yoke 4 is moved inward to its limit so that the links 5 are broughtinto alinement with the connected parts, it is apparent that the togglemechanism is self-locked and that it will retain its position untilreleased by the application of due force. This is applied through thesame means by which the yoke was shifted inward, namely, the togglemechanism 16 and 17, the shifter 12 and the band 14 applied to the yoke4. It is obvious that very little force is required toapply the.band toor to disengage it from the hoisting drum. 1n other'words, the power ofthe toggle mechanism increases as the band tightens on the drum, by awell understood law. It

will be further seen that the total power applied by the shifter andconveyed by the toggle links through the cranks and connecting bar isapplied to the pin 9, that is to say, that pin which connects the endsof the friction band. The bar 11 equalizes the action of the cranks aswill be readily perceived. Of course, the points of attachment of thelinks or rather the knuckles 6 to the respective cranks are the samedistance from the respective pins 9 and 10.

We claim 1. The combination with a rotatable shaft, a driving gear keyedthereon and a drum loose thereon and provided with a peripheral frictionsurface, of a friction band applied to said surface, pins passingthrough the peripheral portion of the gear and provided with cranks oneof the pins being connected with both ends of the divided band, singleand double cranks applied to the pins on the outer side of the gear, anequalizing bar connecting the single crank with the double one, a yokewhich is slidable on the hub of the gear, toggle links and pivotedknuckles connecting the yoke with the cranks of the two pins, and ashifter for moving the yoke in and out for applying the band and lockingthe same automatically as shown and described.

2. The combination with a rotatable shaft, a gear fast thereon and ahoisting drum mounted loose thereon and 'having a peripheral frictionsurface, of friction clutch one of them constructed double, anequalizing bar connecting said double crank with the opposite one, ayoke adapted to slide on the hub of the gear, and toggle links whichoperatively connect it on opposite sides with the cranks of therespective pins, the arrangement being such that when the yoke is movedinward the toggles are brought in alinement with the connected parts andthe band thereby locked on the drum, and means for shifting the yoke, asdescribed.

3. The combination with a rotatable shaft, a gear fast thereon and adrum loose thereon, a friction band, cranks and pins connected therewithand toggle mechanism for operating the band and including a yoke adaptedto slide toward and from the gear, of means for shifting such yoke thesame consisting of a pivoted lever, a band ap plied to the yokecircumferentially and connected with said lever, and toggle mechanismalso connected with the lever for shifting it on its pivot, asdescribed.

4. The combination with a rotatable shaft, a driving gear which is fastthereon and a loose hoisting drum mounted on the shaft, of a dividedfriction band applied to the drum, pins passing through the peripheralportion of JAMES P. KARR. JOHN D. RAUCH. Witnesses:

FRANK P. WILKINSON, HARRY C. KESLING.

